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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb7eeab9caf8be28896fd7d7ae175bd858fca88f03378cad24e450eb19fac54' 
  AND token = 'eiNivKyckocTgbMz9KAow0rkd+ihKKd1DivA42yR0V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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