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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518abe27b7b1bccd4908d60a2bfd1bcbcf07a37000978a6de0c1fcb60386046d' 
  AND token = 'jj34WZNwwEjDz2T+zqd5iBZy3RI3EVJM2HDoLGDJv2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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