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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1ed282c87fadd0dd47e3232e0708b02267af8a57a8fe95c40e130e73ef2fe4' 
  AND token = 'Bq8fulocVnAy+2t741LVXP6w9dMVHmpfq6iODEWhRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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