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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3a6ce4abc6fbb1dafbb20e5f839b63e3f0e3aa8da6e3bc960025ef282a3c17' 
  AND token = '/G+SvY2KgShRZ33cQ0jZv1zrc416V18gKJn7zeR2bqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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