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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af77fb190f5baaa13965b70dd3ad437e75b1324ee3690087906f95b21d528318' 
  AND token = '+JqvovdWxtbsgXKJ1v3SKa9jDus5/GaWTGNMonqXeoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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