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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8156fae8f98d09ebdc498312cf9b0804e24c9d4b7d44584ed3352ad7daa3f09e' 
  AND token = 'sgZhH3OPA8/rW3OFtKmfKVAg9Ryq3+1pnr0cPlcWe1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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