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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fe55e14735cda4a35c4bebd6e2e2d263d6efdcea532b074b53e64417dadc39' 
  AND token = 'JJcKgKXalYvLW4KjCCu7/Qrmr+iLiiBbpD4co6EcN+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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