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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6065319c7f0e1ce0b6ed873beed70249ba9489f88e60abd9f7e97f0f0d8964' 
  AND token = 'UYOlSG5jOdkS6WaK4lOMOOC6CJNJS2HXXKZKbpc+ikc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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