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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96277d2dc91002f1dd950b0914fa2a0ce449fd799126e3c6e16b89d63086fcb1' 
  AND token = 'lX1dJx+g2rwGV8w1awksi/++lFmmkUChNPMlTZUOW30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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