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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c0c973121bae0ed03049c5dc7d5f5e8f5b05cfcee5d25ac8491c1cdef89fd5' 
  AND token = 'auddoKw+7mOEozhuXqKuuiNEkuyBIrQl5X5qUtYW/OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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