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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c57c1f8d950aa22fe30cb213e712bc0f9bad66a1114b1ff067d6051102a5fc' 
  AND token = '4Ru2CAjRO7bQHFjMJUJxlmxzp+J3sq8coSWjsedj97A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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