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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f8ff6307afcd7c9e6580e6ff12d47a7d602ee45638aec13b17e035ad95a32f' 
  AND token = 'y4DlMbkAWu7xEUcaLmv2KVEm1eFdTsc/7LCsgU8y8cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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