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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea71df3eda31c7cb2188d45fcafdc5e39728402961773174bdb83772a804dfb2' 
  AND token = 'pahn2fgv8rrSfOE/8TC+1h3Q1F5LHkurp5ZFo6mP6lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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