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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cce288599218d0ccf17d40fcf2474638cccc24aac2ec8a753c132fbe2aedc4' 
  AND token = '/ExI4wPFIfvkuw2A/KantRW7Iu5zMbFH0zyxdo0E+AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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