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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a9de18fe40b9d04fb1984822ceb80bea47c754849d94ad13c97c6d4e1dbdcc' 
  AND token = 'GGPPvnMscsWkHFD8IKtJsdieduMzsY8ndwcwLigLCCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}