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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf2dfd5491930a6a4e72fef970f804c2db187b045c563d259cbe5010d658239' 
  AND token = '0s5NTxNQeer2lA7kBtY+tHgH3s98mZ57Y2Ssm9XvY7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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