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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8c5b4d665717ef210c14f7e7da9d05ab7e4dfcb5f45a0d6dd7df6e33cb712f' 
  AND token = '/CMEUlecnqbZhuOs5kxE/EfkvOBFtNVC40HNFoA4Uos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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