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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0008a4d5f6301f14f1e3ed07162433d39dc9f8c4df48753c1f88695cef9109ed' 
  AND token = 'I24L0e/R3fSf/AbzbTJY67NuwSxU24hpnYvRZxFdz2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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