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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078dc3f85c6aca5ce540e4f88e31e9c9ae4b466d79dbc9d838359176cad05eea' 
  AND token = '4Als2uPhnqpANQvllwz+8Jssnmp3Ahv0DZ7QyOyX6vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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