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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311e979e7a98dade9e657a737fb23498aff5c8a64341f5dc0928359e38baa9d1' 
  AND token = 'ieom1oXuLHiLAx+CvjZb6ePfXdg7ct9AgRQJLoX/4x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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