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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd676b20a3fc96b36af11612f125dc14875aebfc3933087930cb91ad3d4c18e90' 
  AND token = 'C92wL4lxjJ2vgu88F2i82bizp/eo2s4mDQG0QqNc99Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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