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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31127bbdb89ef61673cd6fe269fe6223fc8a26f2bdf75e2e567a4d714b9b89c' 
  AND token = 'WvWSvNDLo3+vbPElWZLaWzw/EHheAfwG7kJKcN5yf4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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