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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fe62c5aaf7f79f5018ffe3367d343c82f5a64d6d8faa331c5178905df049d3' 
  AND token = '2vSmr1hdc+Aun3XC1+QjNU+rxgSpnw9Uv4ixFXWX7Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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