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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9a981cfb1b446f055e2b29f884ce1bfa019a8e087517be16a73284168ce483' 
  AND token = 'pbhZ61y5YIEdQj74x0oM4u+GIqeKY0MhwnMgcqey/S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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