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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a735a093bcdb7012d6037e46236dd5dbf57a9edbd4464f39b0a9937bf6b9ec' 
  AND token = 'pRCddVIn8lG5b9tqfM0EHgogWvc/idjweHVFvcVooHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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