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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bb2303ab4264579028c1ffb5a52506c534c1d390b34aa68b75c8fa042a46b9' 
  AND token = 'aw2L8bVFwNl4lCMu7TicnFKt+Hf611gQI7buojAeAKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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