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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0130a08ee641530ecda3eb2aaa28de90d7a1ef6fda7efe7035895c9097a262c8' 
  AND token = '+FUm8mCFrsIGgFjZr8KM5Z5zJYstt30TN2TtuCsaQPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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