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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd59032b3d9b65c1dd27e4d2ad3fe1b5bb52a96ec6a9533bbce3b627f09fa6e' 
  AND token = 'nDlxomTYilth3pizFv2CK61jHGQ88+ifZZ2UNxC3DnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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