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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671385b96a81bc2cbcf5ca9f13c319662c2a51b69e0b8d08797f6b060d767be7' 
  AND token = 'hhRByuVmv3OxviXc6zIclbvNYqHD+8OPxw2VHpDr+u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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