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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac31568ba2eb44cb9eb988f92e2e69ecf055503113fa57cc6bff16e5abc3b5f' 
  AND token = '1+jNSNTZPtqosJ9yHyr4uwUpPOwXm+Ea6HUyQnWz0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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