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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88ff486794079f6ecde4893f6b33ceeb6a4da3479dee0431e32368cd75c880a' 
  AND token = '1Y1y9TF3AltEkUlMbusFbc2MOodCopD3imr+kQzRbXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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