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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52896f2ba1cd78574da9c37ace9f4f343d8a7be98b202082e2b53c38034dfc41' 
  AND token = 'XTJd1WgI54JdRWi9ghGU0yeEqASzdN3R25FcuBzYRtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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