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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f78dcbbd324a384252d65fec856b8cee4b19674917bf01dd5576c6e2ad3763' 
  AND token = 'Br/eoHh5cFPLAA0SvPFXuuh8/f+4zT5+o4RKuEYbZ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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