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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0615e2af5e2ce4b15ae8a3153513f3f88d2e32b48b9e9ddeb9c06032e18b95' 
  AND token = 'vVT3I/MgYbmT7Kc72pC5CCXOXNb73YSCE2bto7lVbsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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