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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d90193d333fd84ee0d9291153f8f801ba24476f9f608e3bf3f4ee4c1cbfcb19' 
  AND token = 'zxNsDeRz0CxMxILtQluk+fSMfi8L9zmXKqiemDc32E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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