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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26312a37c98c177c8ebe886374a86b4ced401fab2bdab44ad0eb000956b80b1' 
  AND token = 'VHFVhMlDVw2ToDkI/f54M2yJXTWcmuXdH9gimuEU/TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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