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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a74255cd6514054d1105ccd714b09a81cec2bfdf26b5633656cd508ef7512e' 
  AND token = '3vxksKaB9GXnJaNubo2PmKxR1Hei2hLvqIF3XMsjxcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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