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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07f7a3fa70926c98b3e97c3fa00bdf31e3bf477dd2cc821abe285a0956bdaf0' 
  AND token = 'm+ft/cLu0VS68DEMwQoOMWVFO164Jk4GqYeAhi2qkgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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