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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13969485e2856f8038baf4a804d2d314d62219089c03c5968aecff01a92c908' 
  AND token = 'Poo+D1UZxBoiLCzWp4jVh/Qcc1k3lnIdwAI068lXUK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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