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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57225d6bedfef3cf52883ccabacc74a18c60e3abcb4838ed33f0bf421d92c966' 
  AND token = '0AbDXRQeq09YrbuRDye0pfXoLE3Ij58mlzxpCoNip8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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