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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b9228ecd5c82dae79ad051e88e64deb2da54a7277c711b6639b879f892cde9' 
  AND token = 'Zlxj57yWvtljMHI2/y7M3YYWm1P+AFyTrMEiIa5qFYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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