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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e30dac30e2279386bf1c8d88a849bb4752986c3f5b5b43503abd1cd937a5af2' 
  AND token = 'jX8h7/jfcMj/sJiniFqmV90c2FW+iXf4JXBdhuQsXXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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