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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc115c0696ac59bb5f08f1f20ac53a0f7f1e5f60d3bc494a4c088843af288bcc' 
  AND token = 'qhSxieCZHWhmc6dMwaDPPanTEMzVnK63BfMK13drQyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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