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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc4b2c9160c20df3a2587905b46fbe674ac51f62d2f34f7c1f97c179ddc6f1f' 
  AND token = 'l+mGsz5gtpDzoRQTwGUNfFOYSXm4Ffn+Rm2Pa4PY3hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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