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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cb0b29281dd98a2d79bf29fc25d6cec2bdeff71c80e5e082881d0608edde8c' 
  AND token = 'AA1RnK0diQbKGlxaI751lEtzqLaSj1AoevgZJmPMWx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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