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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7abdefd1652079d4699dbc3087e9fc86b7ac77c3647193de9b1556752235d7' 
  AND token = 'R6Y8IdpcNycL6cJ640Vn6TUS8yICghEpxxAEgIOLBE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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