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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b5bf893ee09e068d5251f1820e6d3d2ea8e9f7bfecbfc70130f7ee37df8ef4' 
  AND token = '1cRkowDEjPRgisQH8vmUm5Ce92sm2cnag5Vmm+LFuHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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