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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dc013c4905e46bdb57cbb2b8b6b0f7428da32ed64b3f5440f4464876df5e06' 
  AND token = 'Ys5QmSA705cQmV4hQXS8zpckeXojuVD6MECwL4i972I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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