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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b7aacfced845b738c24f4bf314137b83df2b68dd6198b19e98a6b9426dd094' 
  AND token = 'g+ZzWu9ck72uN2+1CL5xYJOV3bBDb2gHbEyVhPVd5SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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