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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f19c7d2bbf75cd2c482dfc01e429c72264a33bc282dd9de124e5f68cfcda4a' 
  AND token = '+y5A1/t4jw1jVPemWDKPEmKAkw6FXCV02kihrWxqsNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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