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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9149db75b5e6228115f8b123a4919b1db137314e46d34aceab14d0a7878cfe24' 
  AND token = 'kFlxTZwVURuainBEViuPg0IF+Lnt6vp0e49dh0x9dOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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