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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabc1e530f09f4cd9dfe10c8092e2fed597e6d6b1fe16e1f3618e8397645f215' 
  AND token = '04ZdmlTd2XR/TmHExK4iVQcV2PUCFBuI1463L4nxBng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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