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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23c5f6240036306c719ca9d5843f21585d69fd85f215eac7f8fe225728513a0' 
  AND token = 'YWg5PA34ScEjGYo9r4MOW+5T633pKCC603Q/3g6faac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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