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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def540dcf32fcc845512017c95f0d398e12f33674fb429a902e8f9fc22ae62f1' 
  AND token = '3GWRl3/0399gOwEuRk0KSsgk/seXeLh1Z3kFc0AzpyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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