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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5db778c9fabc04f3de74da96b67f7914d0f02d2ac3c18fbfc554ec0a9813df' 
  AND token = 'KOuF23yE10QXjGUlkdp8okckjc24sN0i9UWBFNbVcao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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