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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f407d043e4cbbd269509e929fde664300a73744644a2e642e2f8664b33a4a744' 
  AND token = 'ppsbSp7WagGrdYHDfo4bSN+bQt08+cZb2N4DEjfog30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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