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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39d3d2eea804d9da7b431fefee3ab3c48ecfa06295d5fb4ea7468fc93dfdf98' 
  AND token = 'XOJkR8qDI6cyLkvd5tdzIg0gnIdZA+FMvHJ7MLVCv5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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