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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c76f5013cd2368842acc47330b1116b2554e61f8e43baf42d97f7683df9637' 
  AND token = 'mejXDeYNDYKY3Uc97vsMsTdwFdN+hAnus2m9n2WaGTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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