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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed29f3e96a1bff6e50e975777e0d84e2240a002e1bec9c18dd8d9baee0cd28c' 
  AND token = 'jyp8eoHmNM9Qe0KkjLe2IDexMkTuiTbYh7G43DXJruY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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