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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76c2a695e37a8965f6385f1d48db27e3446946357c1b2f98bfc7eb596c7d8e6' 
  AND token = 'A/XLbHAzQxH0t7tdukhRm5gjvWkCSNmKsNSH5kqgXts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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