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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa8dfe4f1117d5d0716b7bfe7cd18ef7af47ab57f65a8752d730aeccc36dd4e' 
  AND token = 'nEXC6liST+YKa7jvyFai7y3v0r5IRS762sZrB9DR3/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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