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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286b10b9db1ba740dcf12b2554843e52b3108f16bdbf60658330da0cc3c19bb6' 
  AND token = 'Hf1775SYy9eu+AnEGXYAvDSan+MLc6+9DgtccHblMnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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